It's the most restrictive. They can only do the pieces that INAC isn't doing and delegates to them, because INAC is responsible for everything that goes on in that first nation. As we move to the FNLMA, it's much more flexible. If you move to a comprehensive land claims situation, now the first nation has full responsibility and autonomy over developing what should be on that land.
As an example, under the Indian Act, in many situations you have what they call certificates of possession. They may have been granted by the crown perhaps quite a long time ago, to the extent that often it's very difficult for the first nation to even design where roads or commercial establishments would be on the first nation. The certificates of possession effectively say that the crown still owns the land but that an individual has full rights to it, and sometimes those rights of the individual get passed on to numerous descendants, for example.
Certainly we've been told of situations of a plot of land notionally being divided among dozens of descendants of the original CP holder to the point that it's virtually impossible to know who everyone is who owns it, let alone how to regather it.
The comprehensive land claims are the way to have most use of the land.